Preheat oven to 350 degrees. Line rimmed baking pan with parchment paper.
Mash bananas in a medium bowl with the back of a fork; whisk in peanut butter. Stir in oats and optional add-ins, if desired; using 2 small spoons, drop about 1 heaping tablespoon dough 2 inches apart on prepared pan.
Bake cookies 12 minutes or until lightly browned; cool on pan 5 minutes, then transfer to a wire rack to cool completely. Makes 12 cookies.
Tips: You can add mini chocolate chips, chopped fruit or nuts or even ground cinnamon to make these a bit fancier!
